He was born in Tuxedo, N.Y. He grew up on a small farm in Highland Mills, N.Y.

During World War II, he served in the 99th Infantry Division, was captured during the Battle of the Bulge and was a prisoner of war.

After the war, Mr. Leonard studied engineering at Cooper Union in New York, graduating in 1948. He got his master’s degree in engineering at NYU.

It was at Cooper Union that he met Diana; they married at the Unitarian Universalist in Cavendish, Vt., and their marriage lasted 66 years until his death.

Mr. Leonard worked as a civil engineer at Malcom Pirnie Inc. for 35 years, eventually becoming a vice president. The job took him to many places in the U.S. and around the world to Venezuela and Egypt.

He and Diana lived in New Jersey and Connecticut before retiring to Cavendish. They moved to Colorado a year and a half ago.

Mr. Leonard served on many boards, including as the Solid Waste District representative for Cavendish for more than 13 years. He was an active member in the First Congregational Church in Springfield, and was known as an active leader in the community.

He enjoyed playing golf at the Crown Point golf course.

He is survived by his wife Diana; his three children, Susan Lange, Alfred Leonard, and Diana Pelzer; and his nieces, nephews, grandchildren, and great-grandchildren.

A celebration of life will be held at the Leonards’ home in Cavendish from 3 to 5 p.m. Saturday, Aug. 30, 2014.

Memorial contributions in lieu of flowers can be made to the charity of one’s choice.